[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini syslogd implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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| 8 | *
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| 9 | * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
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| 10 | *
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| 11 | * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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| 12 | *
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[2725] | 13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 14 | */
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| 15 |
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[3232] | 16 | //usage:#define syslogd_trivial_usage
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| 17 | //usage: "[OPTIONS]"
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| 18 | //usage:#define syslogd_full_usage "\n\n"
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| 19 | //usage: "System logging utility\n"
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| 20 | //usage: IF_NOT_FEATURE_SYSLOGD_CFG(
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| 21 | //usage: "(this version of syslogd ignores /etc/syslog.conf)\n"
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| 22 | //usage: )
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| 23 | //usage: "\n -n Run in foreground"
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| 24 | //usage: "\n -O FILE Log to FILE (default:/var/log/messages)"
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| 25 | //usage: "\n -l N Log only messages more urgent than prio N (1-8)"
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| 26 | //usage: "\n -S Smaller output"
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| 27 | //usage: IF_FEATURE_ROTATE_LOGFILE(
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| 28 | //usage: "\n -s SIZE Max size (KB) before rotation (default:200KB, 0=off)"
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| 29 | //usage: "\n -b N N rotated logs to keep (default:1, max=99, 0=purge)"
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| 30 | //usage: )
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| 31 | //usage: IF_FEATURE_REMOTE_LOG(
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| 32 | //usage: "\n -R HOST[:PORT] Log to IP or hostname on PORT (default PORT=514/UDP)"
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| 33 | //usage: "\n -L Log locally and via network (default is network only if -R)"
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| 34 | //usage: )
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| 35 | //usage: IF_FEATURE_SYSLOGD_DUP(
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| 36 | //usage: "\n -D Drop duplicates"
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| 37 | //usage: )
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| 38 | //usage: IF_FEATURE_IPC_SYSLOG(
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| 39 | /* NB: -Csize shouldn't have space (because size is optional) */
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| 40 | //usage: "\n -C[size_kb] Log to shared mem buffer (use logread to read it)"
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| 41 | //usage: )
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| 42 | //usage: IF_FEATURE_SYSLOGD_CFG(
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| 43 | //usage: "\n -f FILE Use FILE as config (default:/etc/syslog.conf)"
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| 44 | //usage: )
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| 45 | /* //usage: "\n -m MIN Minutes between MARK lines (default:20, 0=off)" */
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| 46 | //usage: IF_FEATURE_KMSG_SYSLOG(
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| 47 | //usage: "\n -K Log to kernel printk buffer (use dmesg to read it)"
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| 48 | //usage: )
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| 49 | //usage:
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| 50 | //usage:#define syslogd_example_usage
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| 51 | //usage: "$ syslogd -R masterlog:514\n"
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| 52 | //usage: "$ syslogd -R 192.168.1.1:601\n"
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| 53 |
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[2725] | 54 | /*
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| 55 | * Done in syslogd_and_logger.c:
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[1765] | 56 | #include "libbb.h"
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[2725] | 57 | #define SYSLOG_NAMES
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| 58 | #define SYSLOG_NAMES_CONST
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| 59 | #include <syslog.h>
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| 60 | */
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| 61 |
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[821] | 62 | #include <sys/un.h>
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| 63 | #include <sys/uio.h>
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| 64 |
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[1765] | 65 | #if ENABLE_FEATURE_REMOTE_LOG
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| 66 | #include <netinet/in.h>
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| 67 | #endif
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[821] | 68 |
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[1765] | 69 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 70 | #include <sys/ipc.h>
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| 71 | #include <sys/sem.h>
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| 72 | #include <sys/shm.h>
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| 73 | #endif
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[821] | 74 |
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| 75 |
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[1765] | 76 | #define DEBUG 0
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[821] | 77 |
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[1765] | 78 | /* MARK code is not very useful, is bloat, and broken:
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| 79 | * can deadlock if alarmed to make MARK while writing to IPC buffer
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| 80 | * (semaphores are down but do_mark routine tries to down them again) */
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| 81 | #undef SYSLOGD_MARK
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[821] | 82 |
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[2725] | 83 | /* Write locking does not seem to be useful either */
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| 84 | #undef SYSLOGD_WRLOCK
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[821] | 85 |
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[2725] | 86 | enum {
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| 87 | MAX_READ = CONFIG_FEATURE_SYSLOGD_READ_BUFFER_SIZE,
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| 88 | DNS_WAIT_SEC = 2 * 60,
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| 89 | };
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| 90 |
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[1765] | 91 | /* Semaphore operation structures */
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| 92 | struct shbuf_ds {
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| 93 | int32_t size; /* size of data - 1 */
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| 94 | int32_t tail; /* end of message list */
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| 95 | char data[1]; /* data/messages */
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| 96 | };
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[821] | 97 |
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[2725] | 98 | #if ENABLE_FEATURE_REMOTE_LOG
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| 99 | typedef struct {
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| 100 | int remoteFD;
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| 101 | unsigned last_dns_resolve;
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| 102 | len_and_sockaddr *remoteAddr;
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| 103 | const char *remoteHostname;
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| 104 | } remoteHost_t;
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| 105 | #endif
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| 106 |
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[3232] | 107 | typedef struct logFile_t {
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| 108 | const char *path;
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| 109 | int fd;
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| 110 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 111 | unsigned size;
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| 112 | uint8_t isRegular;
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| 113 | #endif
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| 114 | } logFile_t;
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| 115 |
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| 116 | #if ENABLE_FEATURE_SYSLOGD_CFG
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| 117 | typedef struct logRule_t {
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| 118 | uint8_t enabled_facility_priomap[LOG_NFACILITIES];
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| 119 | struct logFile_t *file;
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| 120 | struct logRule_t *next;
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| 121 | } logRule_t;
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| 122 | #endif
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| 123 |
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[1765] | 124 | /* Allows us to have smaller initializer. Ugly. */
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| 125 | #define GLOBALS \
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[3232] | 126 | logFile_t logFile; \
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[1765] | 127 | /* interval between marks in seconds */ \
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| 128 | /*int markInterval;*/ \
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| 129 | /* level of messages to be logged */ \
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| 130 | int logLevel; \
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[2725] | 131 | IF_FEATURE_ROTATE_LOGFILE( \
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[1765] | 132 | /* max size of file before rotation */ \
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| 133 | unsigned logFileSize; \
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| 134 | /* number of rotated message files */ \
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| 135 | unsigned logFileRotate; \
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| 136 | ) \
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[2725] | 137 | IF_FEATURE_IPC_SYSLOG( \
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[1765] | 138 | int shmid; /* ipc shared memory id */ \
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| 139 | int s_semid; /* ipc semaphore id */ \
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| 140 | int shm_size; \
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| 141 | struct sembuf SMwup[1]; \
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| 142 | struct sembuf SMwdn[3]; \
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[3232] | 143 | ) \
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| 144 | IF_FEATURE_SYSLOGD_CFG( \
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| 145 | logRule_t *log_rules; \
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| 146 | ) \
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| 147 | IF_FEATURE_KMSG_SYSLOG( \
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| 148 | int kmsgfd; \
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| 149 | int primask; \
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[1765] | 150 | )
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[821] | 151 |
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[1765] | 152 | struct init_globals {
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| 153 | GLOBALS
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| 154 | };
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[821] | 155 |
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[1765] | 156 | struct globals {
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| 157 | GLOBALS
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[2725] | 158 |
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| 159 | #if ENABLE_FEATURE_REMOTE_LOG
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| 160 | llist_t *remoteHosts;
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| 161 | #endif
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[1765] | 162 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 163 | struct shbuf_ds *shbuf;
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| 164 | #endif
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| 165 | time_t last_log_time;
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[2725] | 166 | /* localhost's name. We print only first 64 chars */
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| 167 | char *hostname;
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[821] | 168 |
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[1765] | 169 | /* We recv into recvbuf... */
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[2725] | 170 | char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)];
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[1765] | 171 | /* ...then copy to parsebuf, escaping control chars */
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| 172 | /* (can grow x2 max) */
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| 173 | char parsebuf[MAX_READ*2];
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| 174 | /* ...then sprintf into printbuf, adding timestamp (15 chars),
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| 175 | * host (64), fac.prio (20) to the message */
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| 176 | /* (growth by: 15 + 64 + 20 + delims = ~110) */
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| 177 | char printbuf[MAX_READ*2 + 128];
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| 178 | };
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| 179 |
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| 180 | static const struct init_globals init_data = {
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[3232] | 181 | .logFile = {
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| 182 | .path = "/var/log/messages",
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| 183 | .fd = -1,
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| 184 | },
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[1765] | 185 | #ifdef SYSLOGD_MARK
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| 186 | .markInterval = 20 * 60,
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[821] | 187 | #endif
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[1765] | 188 | .logLevel = 8,
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| 189 | #if ENABLE_FEATURE_ROTATE_LOGFILE
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| 190 | .logFileSize = 200 * 1024,
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| 191 | .logFileRotate = 1,
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| 192 | #endif
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| 193 | #if ENABLE_FEATURE_IPC_SYSLOG
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| 194 | .shmid = -1,
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| 195 | .s_semid = -1,
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[3232] | 196 | .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), /* default shm size */
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[1765] | 197 | .SMwup = { {1, -1, IPC_NOWAIT} },
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| 198 | .SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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| 199 | #endif
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| 200 | };
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[821] | 201 |
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[1765] | 202 | #define G (*ptr_to_globals)
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[2725] | 203 | #define INIT_G() do { \
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| 204 | SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \
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| 205 | } while (0)
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[821] | 206 |
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| 207 |
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[1765] | 208 | /* Options */
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| 209 | enum {
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| 210 | OPTBIT_mark = 0, // -m
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| 211 | OPTBIT_nofork, // -n
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| 212 | OPTBIT_outfile, // -O
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| 213 | OPTBIT_loglevel, // -l
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| 214 | OPTBIT_small, // -S
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[2725] | 215 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s
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| 216 | IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b
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| 217 | IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R
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| 218 | IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L
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| 219 | IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C
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| 220 | IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D
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[3232] | 221 | IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f
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| 222 | IF_FEATURE_KMSG_SYSLOG( OPTBIT_kmsg ,) // -K
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[821] | 223 |
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[1765] | 224 | OPT_mark = 1 << OPTBIT_mark ,
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| 225 | OPT_nofork = 1 << OPTBIT_nofork ,
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| 226 | OPT_outfile = 1 << OPTBIT_outfile ,
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| 227 | OPT_loglevel = 1 << OPTBIT_loglevel,
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| 228 | OPT_small = 1 << OPTBIT_small ,
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[2725] | 229 | OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0,
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| 230 | OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0,
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| 231 | OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0,
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| 232 | OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0,
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| 233 | OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0,
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| 234 | OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0,
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[3232] | 235 | OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0,
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| 236 | OPT_kmsg = IF_FEATURE_KMSG_SYSLOG( (1 << OPTBIT_kmsg )) + 0,
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| 237 |
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[1765] | 238 | };
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| 239 | #define OPTION_STR "m:nO:l:S" \
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[2725] | 240 | IF_FEATURE_ROTATE_LOGFILE("s:" ) \
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| 241 | IF_FEATURE_ROTATE_LOGFILE("b:" ) \
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| 242 | IF_FEATURE_REMOTE_LOG( "R:" ) \
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| 243 | IF_FEATURE_REMOTE_LOG( "L" ) \
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| 244 | IF_FEATURE_IPC_SYSLOG( "C::") \
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[3232] | 245 | IF_FEATURE_SYSLOGD_DUP( "D" ) \
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| 246 | IF_FEATURE_SYSLOGD_CFG( "f:" ) \
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| 247 | IF_FEATURE_KMSG_SYSLOG( "K" )
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[1765] | 248 | #define OPTION_DECL *opt_m, *opt_l \
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[2725] | 249 | IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \
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| 250 | IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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[3232] | 251 | IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) \
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| 252 | IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL)
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| 253 | #define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \
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[2725] | 254 | IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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| 255 | IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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[3232] | 256 | IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \
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| 257 | IF_FEATURE_IPC_SYSLOG( ,&opt_C) \
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| 258 | IF_FEATURE_SYSLOGD_CFG( ,&opt_f)
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[821] | 259 |
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[1765] | 260 |
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[3232] | 261 | #if ENABLE_FEATURE_SYSLOGD_CFG
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| 262 | static const CODE* find_by_name(char *name, const CODE* c_set)
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| 263 | {
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| 264 | for (; c_set->c_name; c_set++) {
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| 265 | if (strcmp(name, c_set->c_name) == 0)
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| 266 | return c_set;
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| 267 | }
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| 268 | return NULL;
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| 269 | }
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| 270 | #endif
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| 271 | static const CODE* find_by_val(int val, const CODE* c_set)
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| 272 | {
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| 273 | for (; c_set->c_name; c_set++) {
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| 274 | if (c_set->c_val == val)
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| 275 | return c_set;
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| 276 | }
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| 277 | return NULL;
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| 278 | }
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| 279 |
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| 280 | #if ENABLE_FEATURE_SYSLOGD_CFG
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| 281 | static void parse_syslogdcfg(const char *file)
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| 282 | {
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| 283 | char *t;
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| 284 | logRule_t **pp_rule;
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| 285 | /* tok[0] set of selectors */
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| 286 | /* tok[1] file name */
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| 287 | /* tok[2] has to be NULL */
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| 288 | char *tok[3];
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| 289 | parser_t *parser;
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| 290 |
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| 291 | parser = config_open2(file ? file : "/etc/syslog.conf",
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| 292 | file ? xfopen_for_read : fopen_for_read);
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| 293 | if (!parser)
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| 294 | /* didn't find default /etc/syslog.conf */
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| 295 | /* proceed as if we built busybox without config support */
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| 296 | return;
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| 297 |
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| 298 | /* use ptr to ptr to avoid checking whether head was initialized */
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| 299 | pp_rule = &G.log_rules;
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| 300 | /* iterate through lines of config, skipping comments */
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| 301 | while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
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| 302 | char *cur_selector;
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| 303 | logRule_t *cur_rule;
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| 304 |
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| 305 | /* unexpected trailing token? */
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| 306 | if (tok[2])
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| 307 | goto cfgerr;
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| 308 |
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| 309 | cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule));
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| 310 |
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| 311 | cur_selector = tok[0];
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| 312 | /* iterate through selectors: "kern.info;kern.!err;..." */
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| 313 | do {
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| 314 | const CODE *code;
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| 315 | char *next_selector;
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| 316 | uint8_t negated_prio; /* "kern.!err" */
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| 317 | uint8_t single_prio; /* "kern.=err" */
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| 318 | uint32_t facmap; /* bitmap of enabled facilities */
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| 319 | uint8_t primap; /* bitmap of enabled priorities */
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| 320 | unsigned i;
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| 321 |
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| 322 | next_selector = strchr(cur_selector, ';');
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| 323 | if (next_selector)
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| 324 | *next_selector++ = '\0';
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| 325 |
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| 326 | t = strchr(cur_selector, '.');
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| 327 | if (!t)
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| 328 | goto cfgerr;
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| 329 | *t++ = '\0'; /* separate facility from priority */
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| 330 |
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| 331 | negated_prio = 0;
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| 332 | single_prio = 0;
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| 333 | if (*t == '!') {
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| 334 | negated_prio = 1;
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| 335 | ++t;
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| 336 | }
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| 337 | if (*t == '=') {
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| 338 | single_prio = 1;
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| 339 | ++t;
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| 340 | }
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| 341 |
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| 342 | /* parse priority */
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| 343 | if (*t == '*')
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| 344 | primap = 0xff; /* all 8 log levels enabled */
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| 345 | else {
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| 346 | uint8_t priority;
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| 347 | code = find_by_name(t, prioritynames);
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| 348 | if (!code)
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| 349 | goto cfgerr;
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| 350 | primap = 0;
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| 351 | priority = code->c_val;
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| 352 | if (priority == INTERNAL_NOPRI) {
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| 353 | /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */
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| 354 | negated_prio = 1;
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| 355 | } else {
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| 356 | priority = 1 << priority;
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| 357 | do {
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| 358 | primap |= priority;
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| 359 | if (single_prio)
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| 360 | break;
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| 361 | priority >>= 1;
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| 362 | } while (priority);
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| 363 | if (negated_prio)
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| 364 | primap = ~primap;
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| 365 | }
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| 366 | }
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| 367 |
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| 368 | /* parse facility */
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| 369 | if (*cur_selector == '*')
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| 370 | facmap = (1<<LOG_NFACILITIES) - 1;
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| 371 | else {
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| 372 | char *next_facility;
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| 373 | facmap = 0;
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| 374 | t = cur_selector;
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| 375 | /* iterate through facilities: "kern,daemon.<priospec>" */
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| 376 | do {
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| 377 | next_facility = strchr(t, ',');
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| 378 | if (next_facility)
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| 379 | *next_facility++ = '\0';
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| 380 | code = find_by_name(t, facilitynames);
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| 381 | if (!code)
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| 382 | goto cfgerr;
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| 383 | /* "mark" is not a real facility, skip it */
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| 384 | if (code->c_val != INTERNAL_MARK)
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| 385 | facmap |= 1<<(LOG_FAC(code->c_val));
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---|
| 386 | t = next_facility;
|
---|
| 387 | } while (t);
|
---|
| 388 | }
|
---|
| 389 |
|
---|
| 390 | /* merge result with previous selectors */
|
---|
| 391 | for (i = 0; i < LOG_NFACILITIES; ++i) {
|
---|
| 392 | if (!(facmap & (1<<i)))
|
---|
| 393 | continue;
|
---|
| 394 | if (negated_prio)
|
---|
| 395 | cur_rule->enabled_facility_priomap[i] &= primap;
|
---|
| 396 | else
|
---|
| 397 | cur_rule->enabled_facility_priomap[i] |= primap;
|
---|
| 398 | }
|
---|
| 399 |
|
---|
| 400 | cur_selector = next_selector;
|
---|
| 401 | } while (cur_selector);
|
---|
| 402 |
|
---|
| 403 | /* check whether current file name was mentioned in previous rules or
|
---|
| 404 | * as global logfile (G.logFile).
|
---|
| 405 | */
|
---|
| 406 | if (strcmp(G.logFile.path, tok[1]) == 0) {
|
---|
| 407 | cur_rule->file = &G.logFile;
|
---|
| 408 | goto found;
|
---|
| 409 | }
|
---|
| 410 | /* temporarily use cur_rule as iterator, but *pp_rule still points
|
---|
| 411 | * to currently processing rule entry.
|
---|
| 412 | * NOTE: *pp_rule points to the current (and last in the list) rule.
|
---|
| 413 | */
|
---|
| 414 | for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) {
|
---|
| 415 | if (strcmp(cur_rule->file->path, tok[1]) == 0) {
|
---|
| 416 | /* found - reuse the same file structure */
|
---|
| 417 | (*pp_rule)->file = cur_rule->file;
|
---|
| 418 | cur_rule = *pp_rule;
|
---|
| 419 | goto found;
|
---|
| 420 | }
|
---|
| 421 | }
|
---|
| 422 | cur_rule->file = xzalloc(sizeof(*cur_rule->file));
|
---|
| 423 | cur_rule->file->fd = -1;
|
---|
| 424 | cur_rule->file->path = xstrdup(tok[1]);
|
---|
| 425 | found:
|
---|
| 426 | pp_rule = &cur_rule->next;
|
---|
| 427 | }
|
---|
| 428 | config_close(parser);
|
---|
| 429 | return;
|
---|
| 430 |
|
---|
| 431 | cfgerr:
|
---|
| 432 | bb_error_msg_and_die("error in '%s' at line %d",
|
---|
| 433 | file ? file : "/etc/syslog.conf",
|
---|
| 434 | parser->lineno);
|
---|
| 435 | }
|
---|
| 436 | #endif
|
---|
| 437 |
|
---|
[821] | 438 | /* circular buffer variables/structures */
|
---|
[1765] | 439 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
[821] | 440 |
|
---|
| 441 | #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
|
---|
| 442 | #error Sorry, you must set the syslogd buffer size to at least 4KB.
|
---|
| 443 | #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
|
---|
| 444 | #endif
|
---|
| 445 |
|
---|
[2725] | 446 | /* our shared key (syslogd.c and logread.c must be in sync) */
|
---|
| 447 | enum { KEY_ID = 0x414e4547 }; /* "GENA" */
|
---|
[821] | 448 |
|
---|
| 449 | static void ipcsyslog_cleanup(void)
|
---|
| 450 | {
|
---|
[1765] | 451 | if (G.shmid != -1) {
|
---|
| 452 | shmdt(G.shbuf);
|
---|
[821] | 453 | }
|
---|
[1765] | 454 | if (G.shmid != -1) {
|
---|
| 455 | shmctl(G.shmid, IPC_RMID, NULL);
|
---|
[821] | 456 | }
|
---|
[1765] | 457 | if (G.s_semid != -1) {
|
---|
| 458 | semctl(G.s_semid, 0, IPC_RMID, 0);
|
---|
[821] | 459 | }
|
---|
| 460 | }
|
---|
| 461 |
|
---|
| 462 | static void ipcsyslog_init(void)
|
---|
| 463 | {
|
---|
[1765] | 464 | if (DEBUG)
|
---|
[2725] | 465 | printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size);
|
---|
[821] | 466 |
|
---|
[1765] | 467 | G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644);
|
---|
| 468 | if (G.shmid == -1) {
|
---|
| 469 | bb_perror_msg_and_die("shmget");
|
---|
| 470 | }
|
---|
[821] | 471 |
|
---|
[1765] | 472 | G.shbuf = shmat(G.shmid, NULL, 0);
|
---|
[2725] | 473 | if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */
|
---|
[1765] | 474 | bb_perror_msg_and_die("shmat");
|
---|
| 475 | }
|
---|
[821] | 476 |
|
---|
[1765] | 477 | memset(G.shbuf, 0, G.shm_size);
|
---|
| 478 | G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1;
|
---|
| 479 | /*G.shbuf->tail = 0;*/
|
---|
| 480 |
|
---|
[3232] | 481 | /* we'll trust the OS to set initial semval to 0 (let's hope) */
|
---|
[1765] | 482 | G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
|
---|
| 483 | if (G.s_semid == -1) {
|
---|
| 484 | if (errno == EEXIST) {
|
---|
| 485 | G.s_semid = semget(KEY_ID, 2, 0);
|
---|
| 486 | if (G.s_semid != -1)
|
---|
| 487 | return;
|
---|
[821] | 488 | }
|
---|
[1765] | 489 | bb_perror_msg_and_die("semget");
|
---|
[821] | 490 | }
|
---|
| 491 | }
|
---|
| 492 |
|
---|
[1765] | 493 | /* Write message to shared mem buffer */
|
---|
[3232] | 494 | static void log_to_shmem(const char *msg)
|
---|
[821] | 495 | {
|
---|
[1765] | 496 | int old_tail, new_tail;
|
---|
[3232] | 497 | int len;
|
---|
[821] | 498 |
|
---|
[1765] | 499 | if (semop(G.s_semid, G.SMwdn, 3) == -1) {
|
---|
| 500 | bb_perror_msg_and_die("SMwdn");
|
---|
| 501 | }
|
---|
[821] | 502 |
|
---|
[1765] | 503 | /* Circular Buffer Algorithm:
|
---|
[821] | 504 | * --------------------------
|
---|
[1765] | 505 | * tail == position where to store next syslog message.
|
---|
| 506 | * tail's max value is (shbuf->size - 1)
|
---|
| 507 | * Last byte of buffer is never used and remains NUL.
|
---|
[821] | 508 | */
|
---|
[3232] | 509 | len = strlen(msg) + 1; /* length with NUL included */
|
---|
[1765] | 510 | again:
|
---|
| 511 | old_tail = G.shbuf->tail;
|
---|
| 512 | new_tail = old_tail + len;
|
---|
| 513 | if (new_tail < G.shbuf->size) {
|
---|
| 514 | /* store message, set new tail */
|
---|
| 515 | memcpy(G.shbuf->data + old_tail, msg, len);
|
---|
| 516 | G.shbuf->tail = new_tail;
|
---|
[821] | 517 | } else {
|
---|
[1765] | 518 | /* k == available buffer space ahead of old tail */
|
---|
| 519 | int k = G.shbuf->size - old_tail;
|
---|
| 520 | /* copy what fits to the end of buffer, and repeat */
|
---|
| 521 | memcpy(G.shbuf->data + old_tail, msg, k);
|
---|
| 522 | msg += k;
|
---|
| 523 | len -= k;
|
---|
| 524 | G.shbuf->tail = 0;
|
---|
| 525 | goto again;
|
---|
[821] | 526 | }
|
---|
[1765] | 527 | if (semop(G.s_semid, G.SMwup, 1) == -1) {
|
---|
| 528 | bb_perror_msg_and_die("SMwup");
|
---|
| 529 | }
|
---|
| 530 | if (DEBUG)
|
---|
| 531 | printf("tail:%d\n", G.shbuf->tail);
|
---|
[821] | 532 | }
|
---|
[1765] | 533 | #else
|
---|
[3232] | 534 | static void ipcsyslog_cleanup(void) {}
|
---|
| 535 | static void ipcsyslog_init(void) {}
|
---|
[1765] | 536 | void log_to_shmem(const char *msg);
|
---|
| 537 | #endif /* FEATURE_IPC_SYSLOG */
|
---|
[821] | 538 |
|
---|
[3232] | 539 | #if ENABLE_FEATURE_KMSG_SYSLOG
|
---|
| 540 | static void kmsg_init(void)
|
---|
| 541 | {
|
---|
| 542 | G.kmsgfd = xopen("/dev/kmsg", O_WRONLY);
|
---|
[1765] | 543 |
|
---|
[3232] | 544 | /*
|
---|
| 545 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
---|
| 546 | * from 3.5 onwards the full syslog facility/priority format is supported
|
---|
| 547 | */
|
---|
| 548 | if (get_linux_version_code() < KERNEL_VERSION(3,5,0))
|
---|
| 549 | G.primask = LOG_PRIMASK;
|
---|
| 550 | else
|
---|
| 551 | G.primask = -1;
|
---|
| 552 | }
|
---|
| 553 |
|
---|
| 554 | static void kmsg_cleanup(void)
|
---|
| 555 | {
|
---|
| 556 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 557 | close(G.kmsgfd);
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | /* Write message to /dev/kmsg */
|
---|
| 561 | static void log_to_kmsg(int pri, const char *msg)
|
---|
| 562 | {
|
---|
| 563 | /*
|
---|
| 564 | * kernel < 3.5 expects single char printk KERN_* priority prefix,
|
---|
| 565 | * from 3.5 onwards the full syslog facility/priority format is supported
|
---|
| 566 | */
|
---|
| 567 | pri &= G.primask;
|
---|
| 568 |
|
---|
| 569 | write(G.kmsgfd, G.printbuf, sprintf(G.printbuf, "<%d>%s\n", pri, msg));
|
---|
| 570 | }
|
---|
| 571 | #else
|
---|
| 572 | static void kmsg_init(void) {}
|
---|
| 573 | static void kmsg_cleanup(void) {}
|
---|
| 574 | static void log_to_kmsg(int pri UNUSED_PARAM, const char *msg UNUSED_PARAM) {}
|
---|
| 575 | #endif /* FEATURE_KMSG_SYSLOG */
|
---|
| 576 |
|
---|
[821] | 577 | /* Print a message to the log file. */
|
---|
[3232] | 578 | static void log_locally(time_t now, char *msg, logFile_t *log_file)
|
---|
[821] | 579 | {
|
---|
[2725] | 580 | #ifdef SYSLOGD_WRLOCK
|
---|
[821] | 581 | struct flock fl;
|
---|
[2725] | 582 | #endif
|
---|
[1765] | 583 | int len = strlen(msg);
|
---|
[821] | 584 |
|
---|
[3232] | 585 | if (log_file->fd >= 0) {
|
---|
[2725] | 586 | /* Reopen log file every second. This allows admin
|
---|
| 587 | * to delete the file and not worry about restarting us.
|
---|
| 588 | * This costs almost nothing since it happens
|
---|
| 589 | * _at most_ once a second.
|
---|
| 590 | */
|
---|
| 591 | if (!now)
|
---|
| 592 | now = time(NULL);
|
---|
| 593 | if (G.last_log_time != now) {
|
---|
| 594 | G.last_log_time = now;
|
---|
[3232] | 595 | close(log_file->fd);
|
---|
[1765] | 596 | goto reopen;
|
---|
| 597 | }
|
---|
| 598 | } else {
|
---|
| 599 | reopen:
|
---|
[3232] | 600 | log_file->fd = open(log_file->path, O_WRONLY | O_CREAT
|
---|
[2725] | 601 | | O_NOCTTY | O_APPEND | O_NONBLOCK,
|
---|
| 602 | 0666);
|
---|
[3232] | 603 | if (log_file->fd < 0) {
|
---|
[1765] | 604 | /* cannot open logfile? - print to /dev/console then */
|
---|
[2725] | 605 | int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
|
---|
[1765] | 606 | if (fd < 0)
|
---|
| 607 | fd = 2; /* then stderr, dammit */
|
---|
| 608 | full_write(fd, msg, len);
|
---|
| 609 | if (fd != 2)
|
---|
| 610 | close(fd);
|
---|
| 611 | return;
|
---|
| 612 | }
|
---|
| 613 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
| 614 | {
|
---|
| 615 | struct stat statf;
|
---|
[3232] | 616 | log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode));
|
---|
[1765] | 617 | /* bug (mostly harmless): can wrap around if file > 4gb */
|
---|
[3232] | 618 | log_file->size = statf.st_size;
|
---|
[1765] | 619 | }
|
---|
| 620 | #endif
|
---|
| 621 | }
|
---|
| 622 |
|
---|
[2725] | 623 | #ifdef SYSLOGD_WRLOCK
|
---|
[821] | 624 | fl.l_whence = SEEK_SET;
|
---|
| 625 | fl.l_start = 0;
|
---|
| 626 | fl.l_len = 1;
|
---|
[1765] | 627 | fl.l_type = F_WRLCK;
|
---|
[3232] | 628 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 629 | #endif
|
---|
[821] | 630 |
|
---|
[1765] | 631 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
[3232] | 632 | if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) {
|
---|
[1765] | 633 | if (G.logFileRotate) { /* always 0..99 */
|
---|
[3232] | 634 | int i = strlen(log_file->path) + 3 + 1;
|
---|
[1765] | 635 | char oldFile[i];
|
---|
| 636 | char newFile[i];
|
---|
| 637 | i = G.logFileRotate - 1;
|
---|
| 638 | /* rename: f.8 -> f.9; f.7 -> f.8; ... */
|
---|
| 639 | while (1) {
|
---|
[3232] | 640 | sprintf(newFile, "%s.%d", log_file->path, i);
|
---|
[1765] | 641 | if (i == 0) break;
|
---|
[3232] | 642 | sprintf(oldFile, "%s.%d", log_file->path, --i);
|
---|
[2725] | 643 | /* ignore errors - file might be missing */
|
---|
[1765] | 644 | rename(oldFile, newFile);
|
---|
| 645 | }
|
---|
| 646 | /* newFile == "f.0" now */
|
---|
[3232] | 647 | rename(log_file->path, newFile);
|
---|
| 648 | /* Incredibly, if F and F.0 are hardlinks, POSIX
|
---|
| 649 | * _demands_ that rename returns 0 but does not
|
---|
| 650 | * remove F!!!
|
---|
| 651 | * (hardlinked F/F.0 pair was observed after
|
---|
| 652 | * power failure during rename()).
|
---|
| 653 | * Ensure old file is gone:
|
---|
| 654 | */
|
---|
| 655 | unlink(log_file->path);
|
---|
[2725] | 656 | #ifdef SYSLOGD_WRLOCK
|
---|
[1765] | 657 | fl.l_type = F_UNLCK;
|
---|
[3232] | 658 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 659 | #endif
|
---|
[3232] | 660 | close(log_file->fd);
|
---|
[1765] | 661 | goto reopen;
|
---|
| 662 | }
|
---|
[3232] | 663 | ftruncate(log_file->fd, 0);
|
---|
[1765] | 664 | }
|
---|
[3232] | 665 | log_file->size +=
|
---|
[1765] | 666 | #endif
|
---|
[3232] | 667 | full_write(log_file->fd, msg, len);
|
---|
[2725] | 668 | #ifdef SYSLOGD_WRLOCK
|
---|
[1765] | 669 | fl.l_type = F_UNLCK;
|
---|
[3232] | 670 | fcntl(log_file->fd, F_SETLKW, &fl);
|
---|
[2725] | 671 | #endif
|
---|
[1765] | 672 | }
|
---|
[821] | 673 |
|
---|
[1765] | 674 | static void parse_fac_prio_20(int pri, char *res20)
|
---|
| 675 | {
|
---|
| 676 | const CODE *c_pri, *c_fac;
|
---|
[821] | 677 |
|
---|
[3232] | 678 | c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames);
|
---|
| 679 | if (c_fac) {
|
---|
| 680 | c_pri = find_by_val(LOG_PRI(pri), prioritynames);
|
---|
| 681 | if (c_pri) {
|
---|
| 682 | snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name);
|
---|
| 683 | return;
|
---|
[821] | 684 | }
|
---|
| 685 | }
|
---|
[3232] | 686 | snprintf(res20, 20, "<%d>", pri);
|
---|
[821] | 687 | }
|
---|
| 688 |
|
---|
[1765] | 689 | /* len parameter is used only for "is there a timestamp?" check.
|
---|
[2725] | 690 | * NB: some callers cheat and supply len==0 when they know
|
---|
| 691 | * that there is no timestamp, short-circuiting the test. */
|
---|
[1765] | 692 | static void timestamp_and_log(int pri, char *msg, int len)
|
---|
[821] | 693 | {
|
---|
| 694 | char *timestamp;
|
---|
[2725] | 695 | time_t now;
|
---|
[821] | 696 |
|
---|
[2725] | 697 | /* Jan 18 00:11:22 msg... */
|
---|
| 698 | /* 01234567890123456 */
|
---|
[1765] | 699 | if (len < 16 || msg[3] != ' ' || msg[6] != ' '
|
---|
| 700 | || msg[9] != ':' || msg[12] != ':' || msg[15] != ' '
|
---|
| 701 | ) {
|
---|
[821] | 702 | time(&now);
|
---|
[2725] | 703 | timestamp = ctime(&now) + 4; /* skip day of week */
|
---|
[821] | 704 | } else {
|
---|
[2725] | 705 | now = 0;
|
---|
[821] | 706 | timestamp = msg;
|
---|
| 707 | msg += 16;
|
---|
| 708 | }
|
---|
[1765] | 709 | timestamp[15] = '\0';
|
---|
[821] | 710 |
|
---|
[3232] | 711 | if (option_mask32 & OPT_kmsg) {
|
---|
| 712 | log_to_kmsg(pri, msg);
|
---|
| 713 | return;
|
---|
| 714 | }
|
---|
| 715 |
|
---|
[2725] | 716 | if (option_mask32 & OPT_small)
|
---|
| 717 | sprintf(G.printbuf, "%s %s\n", timestamp, msg);
|
---|
| 718 | else {
|
---|
| 719 | char res[20];
|
---|
| 720 | parse_fac_prio_20(pri, res);
|
---|
| 721 | sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
|
---|
| 722 | }
|
---|
| 723 |
|
---|
[1765] | 724 | /* Log message locally (to file or shared mem) */
|
---|
[3232] | 725 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
| 726 | {
|
---|
| 727 | bool match = 0;
|
---|
| 728 | logRule_t *rule;
|
---|
| 729 | uint8_t facility = LOG_FAC(pri);
|
---|
| 730 | uint8_t prio_bit = 1 << LOG_PRI(pri);
|
---|
| 731 |
|
---|
| 732 | for (rule = G.log_rules; rule; rule = rule->next) {
|
---|
| 733 | if (rule->enabled_facility_priomap[facility] & prio_bit) {
|
---|
| 734 | log_locally(now, G.printbuf, rule->file);
|
---|
| 735 | match = 1;
|
---|
| 736 | }
|
---|
| 737 | }
|
---|
| 738 | if (match)
|
---|
| 739 | return;
|
---|
| 740 | }
|
---|
| 741 | #endif
|
---|
| 742 | if (LOG_PRI(pri) < G.logLevel) {
|
---|
| 743 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
| 744 | if ((option_mask32 & OPT_circularlog) && G.shbuf) {
|
---|
| 745 | log_to_shmem(G.printbuf);
|
---|
| 746 | return;
|
---|
| 747 | }
|
---|
| 748 | #endif
|
---|
| 749 | log_locally(now, G.printbuf, &G.logFile);
|
---|
| 750 | }
|
---|
[821] | 751 | }
|
---|
| 752 |
|
---|
[2725] | 753 | static void timestamp_and_log_internal(const char *msg)
|
---|
| 754 | {
|
---|
| 755 | /* -L, or no -R */
|
---|
| 756 | if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog))
|
---|
| 757 | return;
|
---|
| 758 | timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0);
|
---|
| 759 | }
|
---|
| 760 |
|
---|
| 761 | /* tmpbuf[len] is a NUL byte (set by caller), but there can be other,
|
---|
| 762 | * embedded NULs. Split messages on each of these NULs, parse prio,
|
---|
| 763 | * escape control chars and log each locally. */
|
---|
[1765] | 764 | static void split_escape_and_log(char *tmpbuf, int len)
|
---|
[821] | 765 | {
|
---|
| 766 | char *p = tmpbuf;
|
---|
| 767 |
|
---|
[1765] | 768 | tmpbuf += len;
|
---|
| 769 | while (p < tmpbuf) {
|
---|
| 770 | char c;
|
---|
| 771 | char *q = G.parsebuf;
|
---|
[821] | 772 | int pri = (LOG_USER | LOG_NOTICE);
|
---|
| 773 |
|
---|
[1765] | 774 | if (*p == '<') {
|
---|
| 775 | /* Parse the magic priority number */
|
---|
| 776 | pri = bb_strtou(p + 1, &p, 10);
|
---|
[2725] | 777 | if (*p == '>')
|
---|
| 778 | p++;
|
---|
| 779 | if (pri & ~(LOG_FACMASK | LOG_PRIMASK))
|
---|
[1765] | 780 | pri = (LOG_USER | LOG_NOTICE);
|
---|
| 781 | }
|
---|
| 782 |
|
---|
| 783 | while ((c = *p++)) {
|
---|
| 784 | if (c == '\n')
|
---|
| 785 | c = ' ';
|
---|
| 786 | if (!(c & ~0x1f) && c != '\t') {
|
---|
[821] | 787 | *q++ = '^';
|
---|
[1765] | 788 | c += '@'; /* ^@, ^A, ^B... */
|
---|
[821] | 789 | }
|
---|
[1765] | 790 | *q++ = c;
|
---|
[821] | 791 | }
|
---|
| 792 | *q = '\0';
|
---|
[2725] | 793 |
|
---|
[821] | 794 | /* Now log it */
|
---|
[3232] | 795 | timestamp_and_log(pri, G.parsebuf, q - G.parsebuf);
|
---|
[821] | 796 | }
|
---|
| 797 | }
|
---|
| 798 |
|
---|
[1765] | 799 | #ifdef SYSLOGD_MARK
|
---|
| 800 | static void do_mark(int sig)
|
---|
| 801 | {
|
---|
| 802 | if (G.markInterval) {
|
---|
[2725] | 803 | timestamp_and_log_internal("-- MARK --");
|
---|
[1765] | 804 | alarm(G.markInterval);
|
---|
| 805 | }
|
---|
| 806 | }
|
---|
| 807 | #endif
|
---|
| 808 |
|
---|
[2725] | 809 | /* Don't inline: prevent struct sockaddr_un to take up space on stack
|
---|
| 810 | * permanently */
|
---|
| 811 | static NOINLINE int create_socket(void)
|
---|
[1765] | 812 | {
|
---|
[821] | 813 | struct sockaddr_un sunx;
|
---|
| 814 | int sock_fd;
|
---|
[1765] | 815 | char *dev_log_name;
|
---|
[821] | 816 |
|
---|
[3232] | 817 | #if ENABLE_FEATURE_SYSTEMD
|
---|
| 818 | if (sd_listen_fds() == 1)
|
---|
| 819 | return SD_LISTEN_FDS_START;
|
---|
| 820 | #endif
|
---|
| 821 |
|
---|
[821] | 822 | memset(&sunx, 0, sizeof(sunx));
|
---|
| 823 | sunx.sun_family = AF_UNIX;
|
---|
[1765] | 824 |
|
---|
| 825 | /* Unlink old /dev/log or object it points to. */
|
---|
| 826 | /* (if it exists, bind will fail) */
|
---|
[2725] | 827 | strcpy(sunx.sun_path, "/dev/log");
|
---|
| 828 | dev_log_name = xmalloc_follow_symlinks("/dev/log");
|
---|
[1765] | 829 | if (dev_log_name) {
|
---|
| 830 | safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path));
|
---|
| 831 | free(dev_log_name);
|
---|
[821] | 832 | }
|
---|
[2725] | 833 | unlink(sunx.sun_path);
|
---|
[821] | 834 |
|
---|
[1765] | 835 | sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0);
|
---|
| 836 | xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx));
|
---|
[2725] | 837 | chmod("/dev/log", 0666);
|
---|
[1765] | 838 |
|
---|
[2725] | 839 | return sock_fd;
|
---|
| 840 | }
|
---|
| 841 |
|
---|
| 842 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 843 | static int try_to_resolve_remote(remoteHost_t *rh)
|
---|
| 844 | {
|
---|
| 845 | if (!rh->remoteAddr) {
|
---|
| 846 | unsigned now = monotonic_sec();
|
---|
| 847 |
|
---|
| 848 | /* Don't resolve name too often - DNS timeouts can be big */
|
---|
| 849 | if ((now - rh->last_dns_resolve) < DNS_WAIT_SEC)
|
---|
| 850 | return -1;
|
---|
| 851 | rh->last_dns_resolve = now;
|
---|
| 852 | rh->remoteAddr = host2sockaddr(rh->remoteHostname, 514);
|
---|
| 853 | if (!rh->remoteAddr)
|
---|
| 854 | return -1;
|
---|
[821] | 855 | }
|
---|
[2725] | 856 | return xsocket(rh->remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0);
|
---|
| 857 | }
|
---|
| 858 | #endif
|
---|
| 859 |
|
---|
| 860 | static void do_syslogd(void) NORETURN;
|
---|
| 861 | static void do_syslogd(void)
|
---|
| 862 | {
|
---|
| 863 | int sock_fd;
|
---|
| 864 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 865 | llist_t *item;
|
---|
| 866 | #endif
|
---|
| 867 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 868 | int last_sz = -1;
|
---|
| 869 | char *last_buf;
|
---|
| 870 | char *recvbuf = G.recvbuf;
|
---|
| 871 | #else
|
---|
| 872 | #define recvbuf (G.recvbuf)
|
---|
| 873 | #endif
|
---|
| 874 |
|
---|
| 875 | /* Set up signal handlers (so that they interrupt read()) */
|
---|
| 876 | signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo);
|
---|
| 877 | signal_no_SA_RESTART_empty_mask(SIGINT, record_signo);
|
---|
| 878 | //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo);
|
---|
| 879 | signal(SIGHUP, SIG_IGN);
|
---|
| 880 | #ifdef SYSLOGD_MARK
|
---|
| 881 | signal(SIGALRM, do_mark);
|
---|
| 882 | alarm(G.markInterval);
|
---|
| 883 | #endif
|
---|
| 884 | sock_fd = create_socket();
|
---|
| 885 |
|
---|
[3232] | 886 | if (option_mask32 & OPT_circularlog)
|
---|
[821] | 887 | ipcsyslog_init();
|
---|
| 888 |
|
---|
[3232] | 889 | if (option_mask32 & OPT_kmsg)
|
---|
| 890 | kmsg_init();
|
---|
| 891 |
|
---|
[2725] | 892 | timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER);
|
---|
[821] | 893 |
|
---|
[2725] | 894 | while (!bb_got_signal) {
|
---|
| 895 | ssize_t sz;
|
---|
[821] | 896 |
|
---|
[2725] | 897 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 898 | last_buf = recvbuf;
|
---|
| 899 | if (recvbuf == G.recvbuf)
|
---|
| 900 | recvbuf = G.recvbuf + MAX_READ;
|
---|
| 901 | else
|
---|
| 902 | recvbuf = G.recvbuf;
|
---|
| 903 | #endif
|
---|
| 904 | read_again:
|
---|
| 905 | sz = read(sock_fd, recvbuf, MAX_READ - 1);
|
---|
| 906 | if (sz < 0) {
|
---|
| 907 | if (!bb_got_signal)
|
---|
| 908 | bb_perror_msg("read from /dev/log");
|
---|
| 909 | break;
|
---|
| 910 | }
|
---|
| 911 |
|
---|
| 912 | /* Drop trailing '\n' and NULs (typically there is one NUL) */
|
---|
| 913 | while (1) {
|
---|
| 914 | if (sz == 0)
|
---|
| 915 | goto read_again;
|
---|
| 916 | /* man 3 syslog says: "A trailing newline is added when needed".
|
---|
| 917 | * However, neither glibc nor uclibc do this:
|
---|
| 918 | * syslog(prio, "test") sends "test\0" to /dev/log,
|
---|
| 919 | * syslog(prio, "test\n") sends "test\n\0".
|
---|
| 920 | * IOW: newline is passed verbatim!
|
---|
| 921 | * I take it to mean that it's syslogd's job
|
---|
| 922 | * to make those look identical in the log files. */
|
---|
| 923 | if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n')
|
---|
| 924 | break;
|
---|
| 925 | sz--;
|
---|
| 926 | }
|
---|
| 927 | #if ENABLE_FEATURE_SYSLOGD_DUP
|
---|
| 928 | if ((option_mask32 & OPT_dup) && (sz == last_sz))
|
---|
| 929 | if (memcmp(last_buf, recvbuf, sz) == 0)
|
---|
[821] | 930 | continue;
|
---|
[2725] | 931 | last_sz = sz;
|
---|
| 932 | #endif
|
---|
| 933 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 934 | /* Stock syslogd sends it '\n'-terminated
|
---|
| 935 | * over network, mimic that */
|
---|
| 936 | recvbuf[sz] = '\n';
|
---|
| 937 |
|
---|
| 938 | /* We are not modifying log messages in any way before send */
|
---|
| 939 | /* Remote site cannot trust _us_ anyway and need to do validation again */
|
---|
| 940 | for (item = G.remoteHosts; item != NULL; item = item->link) {
|
---|
| 941 | remoteHost_t *rh = (remoteHost_t *)item->data;
|
---|
| 942 |
|
---|
| 943 | if (rh->remoteFD == -1) {
|
---|
| 944 | rh->remoteFD = try_to_resolve_remote(rh);
|
---|
| 945 | if (rh->remoteFD == -1)
|
---|
| 946 | continue;
|
---|
[821] | 947 | }
|
---|
| 948 |
|
---|
[2725] | 949 | /* Send message to remote logger.
|
---|
| 950 | * On some errors, close and set remoteFD to -1
|
---|
| 951 | * so that DNS resolution is retried.
|
---|
| 952 | */
|
---|
| 953 | if (sendto(rh->remoteFD, recvbuf, sz+1,
|
---|
| 954 | MSG_DONTWAIT | MSG_NOSIGNAL,
|
---|
| 955 | &(rh->remoteAddr->u.sa), rh->remoteAddr->len) == -1
|
---|
| 956 | ) {
|
---|
| 957 | switch (errno) {
|
---|
| 958 | case ECONNRESET:
|
---|
| 959 | case ENOTCONN: /* paranoia */
|
---|
| 960 | case EPIPE:
|
---|
| 961 | close(rh->remoteFD);
|
---|
| 962 | rh->remoteFD = -1;
|
---|
| 963 | free(rh->remoteAddr);
|
---|
| 964 | rh->remoteAddr = NULL;
|
---|
[1765] | 965 | }
|
---|
[821] | 966 | }
|
---|
[2725] | 967 | }
|
---|
[1765] | 968 | #endif
|
---|
[2725] | 969 | if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
|
---|
| 970 | recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */
|
---|
| 971 | split_escape_and_log(recvbuf, sz);
|
---|
| 972 | }
|
---|
| 973 | } /* while (!bb_got_signal) */
|
---|
| 974 |
|
---|
| 975 | timestamp_and_log_internal("syslogd exiting");
|
---|
| 976 | puts("syslogd exiting");
|
---|
[3232] | 977 | remove_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
| 978 | ipcsyslog_cleanup();
|
---|
| 979 | if (option_mask32 & OPT_kmsg)
|
---|
| 980 | kmsg_cleanup();
|
---|
[2725] | 981 | kill_myself_with_sig(bb_got_signal);
|
---|
| 982 | #undef recvbuf
|
---|
[821] | 983 | }
|
---|
| 984 |
|
---|
[2725] | 985 | int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 986 | int syslogd_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 987 | {
|
---|
[2725] | 988 | int opts;
|
---|
[1765] | 989 | char OPTION_DECL;
|
---|
[2725] | 990 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 991 | llist_t *remoteAddrList = NULL;
|
---|
| 992 | #endif
|
---|
[821] | 993 |
|
---|
[2725] | 994 | INIT_G();
|
---|
[821] | 995 |
|
---|
[2725] | 996 | /* No non-option params, -R can occur multiple times */
|
---|
| 997 | opt_complementary = "=0" IF_FEATURE_REMOTE_LOG(":R::");
|
---|
| 998 | opts = getopt32(argv, OPTION_STR, OPTION_PARAM);
|
---|
| 999 | #if ENABLE_FEATURE_REMOTE_LOG
|
---|
| 1000 | while (remoteAddrList) {
|
---|
| 1001 | remoteHost_t *rh = xzalloc(sizeof(*rh));
|
---|
| 1002 | rh->remoteHostname = llist_pop(&remoteAddrList);
|
---|
| 1003 | rh->remoteFD = -1;
|
---|
| 1004 | rh->last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1;
|
---|
| 1005 | llist_add_to(&G.remoteHosts, rh);
|
---|
| 1006 | }
|
---|
| 1007 | #endif
|
---|
| 1008 |
|
---|
[1765] | 1009 | #ifdef SYSLOGD_MARK
|
---|
[2725] | 1010 | if (opts & OPT_mark) // -m
|
---|
[1765] | 1011 | G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
---|
[821] | 1012 | #endif
|
---|
[2725] | 1013 | //if (opts & OPT_nofork) // -n
|
---|
| 1014 | //if (opts & OPT_outfile) // -O
|
---|
| 1015 | if (opts & OPT_loglevel) // -l
|
---|
[1765] | 1016 | G.logLevel = xatou_range(opt_l, 1, 8);
|
---|
[2725] | 1017 | //if (opts & OPT_small) // -S
|
---|
[1765] | 1018 | #if ENABLE_FEATURE_ROTATE_LOGFILE
|
---|
[2725] | 1019 | if (opts & OPT_filesize) // -s
|
---|
[1765] | 1020 | G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
---|
[2725] | 1021 | if (opts & OPT_rotatecnt) // -b
|
---|
[1765] | 1022 | G.logFileRotate = xatou_range(opt_b, 0, 99);
|
---|
[821] | 1023 | #endif
|
---|
[1765] | 1024 | #if ENABLE_FEATURE_IPC_SYSLOG
|
---|
| 1025 | if (opt_C) // -Cn
|
---|
| 1026 | G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
---|
| 1027 | #endif
|
---|
[821] | 1028 | /* If they have not specified remote logging, then log locally */
|
---|
[2725] | 1029 | if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R
|
---|
[1765] | 1030 | option_mask32 |= OPT_locallog;
|
---|
[3232] | 1031 | #if ENABLE_FEATURE_SYSLOGD_CFG
|
---|
| 1032 | parse_syslogdcfg(opt_f);
|
---|
| 1033 | #endif
|
---|
[821] | 1034 |
|
---|
| 1035 | /* Store away localhost's name before the fork */
|
---|
[2725] | 1036 | G.hostname = safe_gethostname();
|
---|
| 1037 | *strchrnul(G.hostname, '.') = '\0';
|
---|
[821] | 1038 |
|
---|
[2725] | 1039 | if (!(opts & OPT_nofork)) {
|
---|
[1765] | 1040 | bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
---|
| 1041 | }
|
---|
[3232] | 1042 |
|
---|
[2725] | 1043 | //umask(0); - why??
|
---|
[3232] | 1044 | write_pidfile(CONFIG_PID_FILE_PATH "/syslogd.pid");
|
---|
| 1045 |
|
---|
[1765] | 1046 | do_syslogd();
|
---|
| 1047 | /* return EXIT_SUCCESS; */
|
---|
[821] | 1048 | }
|
---|
[2725] | 1049 |
|
---|
| 1050 | /* Clean up. Needed because we are included from syslogd_and_logger.c */
|
---|
| 1051 | #undef DEBUG
|
---|
| 1052 | #undef SYSLOGD_MARK
|
---|
| 1053 | #undef SYSLOGD_WRLOCK
|
---|
| 1054 | #undef G
|
---|
| 1055 | #undef GLOBALS
|
---|
| 1056 | #undef INIT_G
|
---|
| 1057 | #undef OPTION_STR
|
---|
| 1058 | #undef OPTION_DECL
|
---|
| 1059 | #undef OPTION_PARAM
|
---|